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Metric System

The International System of Units (SI) serves as the foundation for global measurement using seven base units: meter (length), gram (mass), second (time), kelvin (temperature), mole (amount), ampere (current), and candela (luminous intensity). It is crucial to differentiate between mass (amount of matter) and weight (force of gravity on mass). SI employs prefixes to indicate multiples of ten, facilitating conversions among units. Explore derived units, temperature conversions, and the importance of intensive versus extensive properties in measurements.

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Metric System

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  1. Metric System

  2. SI System • Standard International System of measurement – metrics • Has seven base units and many other units derived from these seven

  3. Quantity Unit Abbreviation length meter m mass gram g time second s temperature kelvin K amount mole mol current ampere amp intensity candela cd Seven Base Units

  4. Mass vs Weight • Mass is not the same as weight • Mass is the amount of matter in a substance • Weight is a measure of the pull of gravity on the substance • Can you be weightless? Can you be massless?

  5. Derived Units • Many other units are used in the metric system, but they are combinations of the base units • Speed - meter per sec (m/sec) • Volume volume = length x width x height (m) x (m) x (m) = m3 .001 m3 = 1 liter (L) 1 cm3 = 1ml

  6. Prefixes • Metric system utilizes prefixes which indicate multiples of 10 of the unit • kilo- k 1000 • hecto- h 100 • deka- da 10 • deci- d .1 • centi- c .01 • milli- m .001

  7. Converting Between Metric Units 3.65 dam = __________cm 2587 mm = __________hm .0087 hl = __________cl

  8. More Prefixes Mega- M 106 Micro- u 10-6 Nano - n 10-9 Pico- p 10-12

  9. Use the appropriate prefixes 3 x 106 L 15 x 10-9 g 8 x 108 m 3.5 x 10-6L 1.46 x 1010g

  10. Temperature • Metric unit – Kelvin – not used for measurement • Measured in C (celsius) • K = C + 273.15 • Old system is F (farenheit) • C = 5/9 (F -32) • What is 69 F in C and K?

  11. Temperature is an intensive property-does not depend on the amount • Extensive propertiesdo depend on the amount • In the statement “a yellow sample is solid at 25 C. It weighs 6.0g and has a density of 2.3g/cm3” what are the intensive and extensive properties?

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